National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

59°F

15°C

Humidity 64%
Wind Speed NE 7 mph
Barometer 30.20 in (1022.2 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 11 Feb 8:56 pm CST
Extended Forecast for

4 Miles SW San Marcos TX

  • Tonight

    Tonight: Mostly clear, with a low around 51. North northeast wind around 5 mph becoming calm.

    Low: 51 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58. South wind around 5 mph.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 80. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 9am. High near 81. South southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 55. Northwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Slight Chance
    Showers then
    Clear

  • Sunday

    Sunday: Sunny, with a high near 76. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 76 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47. North wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 51. North northeast wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 58. South wind around 5 mph.
Friday
Mostly cloudy, with a high near 80. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers, with thunderstorms also possible after 9am. High near 81. South southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 55. Northwest wind around 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 76. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 47. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
5:46 pm CST Feb 11, 2026
Forecast Valid:
9pm CST Feb 11, 2026-6pm CST Feb 18, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation